﻿using System;
using Xpedite.Resources;
using Xpedite.Resources.Builders;
using Xpedite.Resources.Combiners;
using Xpedite.Resources.Definitions;
using Xpedite.WebAbstraction;

/* Copyright (c) 2010 CBaxter
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), 
 * to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, 
 * and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 
 * IN THE SOFTWARE. 
 */

namespace Xpedite.Extensions
{
  internal static class WebContextExtensions
  {
    public static readonly String ResourceDefinitionFactoryKey = typeof(ResourceDefinitionFactory).AssemblyQualifiedName;
    public static readonly String DefinitionArgsKey = typeof(DefinitionArgs).AssemblyQualifiedName;
    private static readonly Object SyncLock = new Object();

    public static IResourceBuilderFactory GetResourceBuilderFactory(this IWebContext context)
    {
      return context.GetDefinitionArgs().BuilderFactory;
    }

    public static IResourceDefinitionFactory GetResourceDefinitionFactory(this IWebContext context)
    {
      lock (SyncLock)
      {
        var factory = context[ResourceDefinitionFactoryKey] as IResourceDefinitionFactory;

        if (factory != null)
          return factory;

        context[ResourceDefinitionFactoryKey] = factory = new ResourceDefinitionFactory(context.GetDefinitionArgs());

        return factory;
      }
    }

    public static IResourceCache GetResourceCache(this IWebContext context)
    {
      return context.GetDefinitionArgs().ResourceCache;
    }

    private static DefinitionArgs GetDefinitionArgs(this IWebContext context)
    {
      lock (SyncLock)
      {
        var definitionArgs = context[DefinitionArgsKey] as DefinitionArgs;

        if (definitionArgs != null)
          return definitionArgs;

        var combinerFactory = new CombinerFactory();
        var builderFactory = new ResourceBuilderFactory();
        var resourceCache = new ResourceCache(context.Cache);
        var urlGenerator = new ResourceUrlGenerator(() => WebHost.CurrentContext.Request, WebHost.ApplicationVirtualPath);

        context[DefinitionArgsKey] = definitionArgs = new DefinitionArgs(resourceCache, urlGenerator, builderFactory, combinerFactory);

        return definitionArgs;
      }
    }
  }
}
